weechat/doc/en/autogen/aspell_options.xml

<?xml version="1.0" encoding="UTF-8"?>
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<command>aspell.check.commands</command>: comma separated list of commands for which spell checking is enabled (spell checking is disabled for all other commands)
<itemizedlist>
  <listitem>
    <para>type: string</para>
  </listitem>
  <listitem>
    <para>values: any string (default value: 'ame,amsg,away,command,cycle,kick,kickban,me,msg,notice,part,query,quit,topic')</para>
  </listitem>
</itemizedlist>

<command>aspell.check.default_dict</command>: default dictionary (or comma separated list of dictionaries) to use when buffer has no dictionary defined (leave blank to disable aspell on buffers for which you didn't explicitely enabled it)
<itemizedlist>
  <listitem>
    <para>type: string</para>
  </listitem>
  <listitem>
    <para>values: any string (default value: '')</para>
  </listitem>
</itemizedlist>

<command>aspell.check.word_min_length</command>: minimum length for a word to be spell checked (use 0 to check all words)
<itemizedlist>
  <listitem>
    <para>type: integer</para>
  </listitem>
  <listitem>
    <para>values: 0 .. 2147483647 (default value: 2)</para>
  </listitem>
</itemizedlist>

<command>aspell.look.color</command>: color used for mispelled words
<itemizedlist>
  <listitem>
    <para>type: color</para>
  </listitem>
  <listitem>
    <para>values: a color name (default value: lightred)</para>
  </listitem>
</itemizedlist>